| /* minimalistic telnet/network interface it might turn into a wire interface */ |
| /* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org> |
| * All Rights Reserved |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| */ |
| |
| #include <sys/socket.h> |
| #include <netinet/in.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include <openbsc/telnet_interface.h> |
| #include <openbsc/gsm_subscriber.h> |
| #include <openbsc/chan_alloc.h> |
| #include <openbsc/gsm_04_08.h> |
| #include <openbsc/gsm_04_11.h> |
| #include <osmocore/msgb.h> |
| #include <openbsc/abis_rsl.h> |
| #include <openbsc/paging.h> |
| #include <openbsc/signal.h> |
| #include <osmocore/talloc.h> |
| #include <openbsc/debug.h> |
| |
| #include <vty/buffer.h> |
| |
| #define WRITE_CONNECTION(fd, msg...) \ |
| int ret; \ |
| char buf[4096]; \ |
| snprintf(buf, sizeof(buf), msg); \ |
| ret = write(fd, buf, strlen(buf)); |
| |
| |
| /* per connection data */ |
| LLIST_HEAD(active_connections); |
| |
| static void *tall_telnet_ctx; |
| |
| /* per network data */ |
| static int telnet_new_connection(struct bsc_fd *fd, unsigned int what); |
| |
| static struct bsc_fd server_socket = { |
| .when = BSC_FD_READ, |
| .cb = telnet_new_connection, |
| .priv_nr = 0, |
| }; |
| |
| void telnet_init(struct gsm_network *network, int port) { |
| struct sockaddr_in sock_addr; |
| int fd, on = 1; |
| |
| tall_telnet_ctx = talloc_named_const(tall_bsc_ctx, 1, |
| "telnet_connection"); |
| |
| bsc_vty_init(network); |
| |
| fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); |
| |
| if (fd < 0) { |
| LOGP(DNM, LOGL_ERROR, "Telnet interface socket creation failed\n"); |
| return; |
| } |
| |
| setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| |
| memset(&sock_addr, 0, sizeof(sock_addr)); |
| sock_addr.sin_family = AF_INET; |
| sock_addr.sin_port = htons(port); |
| sock_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
| |
| if (bind(fd, (struct sockaddr*)&sock_addr, sizeof(sock_addr)) < 0) { |
| LOGP(DNM, LOGL_ERROR, "Telnet interface failed to bind\n"); |
| return; |
| } |
| |
| if (listen(fd, 0) < 0) { |
| LOGP(DNM, LOGL_ERROR, "Telnet interface failed to listen\n"); |
| return; |
| } |
| |
| server_socket.data = network; |
| server_socket.fd = fd; |
| bsc_register_fd(&server_socket); |
| } |
| |
| extern const char *openbsc_copyright; |
| extern const char *openbsc_version; |
| |
| static void print_welcome(int fd) { |
| int ret; |
| static char *msg = |
| "Welcome to the OpenBSC Control interface\n"; |
| |
| ret = write(fd, msg, strlen(msg)); |
| ret = write(fd, openbsc_copyright, strlen(openbsc_copyright)); |
| } |
| |
| int telnet_close_client(struct bsc_fd *fd) { |
| struct telnet_connection *conn = (struct telnet_connection*)fd->data; |
| |
| close(fd->fd); |
| bsc_unregister_fd(fd); |
| |
| if (conn->dbg) { |
| debug_del_target(conn->dbg); |
| talloc_free(conn->dbg); |
| } |
| |
| llist_del(&conn->entry); |
| talloc_free(conn); |
| return 0; |
| } |
| |
| static int client_data(struct bsc_fd *fd, unsigned int what) |
| { |
| struct telnet_connection *conn = fd->data; |
| int rc = 0; |
| |
| if (what & BSC_FD_READ) { |
| conn->fd.when &= ~BSC_FD_READ; |
| rc = vty_read(conn->vty); |
| } |
| |
| /* vty might have been closed from vithin vty_read() */ |
| if (!conn->vty) |
| return rc; |
| |
| if (what & BSC_FD_WRITE) { |
| rc = buffer_flush_all(conn->vty->obuf, fd->fd); |
| if (rc == BUFFER_EMPTY) |
| conn->fd.when &= ~BSC_FD_WRITE; |
| } |
| |
| return rc; |
| } |
| |
| static int telnet_new_connection(struct bsc_fd *fd, unsigned int what) { |
| struct telnet_connection *connection; |
| struct sockaddr_in sockaddr; |
| socklen_t len = sizeof(sockaddr); |
| int new_connection = accept(fd->fd, (struct sockaddr*)&sockaddr, &len); |
| |
| if (new_connection < 0) { |
| LOGP(DNM, LOGL_ERROR, "telnet accept failed\n"); |
| return -1; |
| } |
| |
| |
| connection = talloc_zero(tall_telnet_ctx, struct telnet_connection); |
| connection->network = (struct gsm_network*)fd->data; |
| connection->fd.data = connection; |
| connection->fd.fd = new_connection; |
| connection->fd.when = BSC_FD_READ; |
| connection->fd.cb = client_data; |
| bsc_register_fd(&connection->fd); |
| llist_add_tail(&connection->entry, &active_connections); |
| |
| print_welcome(new_connection); |
| |
| connection->vty = vty_create(new_connection, connection); |
| if (!connection->vty) { |
| LOGP(DNM, LOGL_ERROR, "couldn't create VTY\n"); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| /* callback from VTY code */ |
| void vty_event(enum event event, int sock, struct vty *vty) |
| { |
| struct telnet_connection *connection = vty->priv; |
| struct bsc_fd *bfd = &connection->fd; |
| |
| if (vty->type != VTY_TERM) |
| return; |
| |
| switch (event) { |
| case VTY_READ: |
| bfd->when |= BSC_FD_READ; |
| break; |
| case VTY_WRITE: |
| bfd->when |= BSC_FD_WRITE; |
| break; |
| case VTY_CLOSED: |
| /* vty layer is about to free() vty */ |
| connection->vty = NULL; |
| telnet_close_client(bfd); |
| break; |
| default: |
| break; |
| } |
| } |
| |